Siemens 371-03182 VALVE ASSY 2W NC 1/2", 2.5CV, EQ PCT BRASS TRIM FXF, PROP ELECTRONIC ACT NSRSiemens 371 03182 Valve assy 2W NC 1 2", 2. 5Cv, Eq Pct Brass Trim FxF, Prop Electronic Act NSR Flowrite 599 Series Valve Assembly features a proportional control (0 to 10 Vdc or 4 to 20 mA), non spring return, 24 Vac electronic actuator. The 2 way, normally closed, 1 2 inch, 2. 5 Cv valve assembly is ANSI Class 250 and has an equal percentage characteristic, brass trim, and female x female end connections. Additional Information Valve TypeTwo way